[gold-silver-copper]

• Two meta config files in one directory are an error naming them all; the names live in META_CONFIG_NAMES.
• find_meta_config, find_parent_meta_config and find_root_meta_dir return Result, so an unreadable or ambiguous config is an error, not "no config".
• nearest_meta_dir (a bare .meta/ folder like ~/.meta/ is not a workspace), workspace_meta_dirs (nearest first; each parent counts only if its own project list names the child; a checkout in a set meta made continues with the workspace the set was made from) and workspace_root, shared by worktree scope and plugin discovery.
• set_source: the checkout a set checkout stands for (the set's root: the record's project; another checkout: that workspace's project with the same repository, normally the one at its place in the set, which mirrors the workspace layout; followed through sets made inside sets; WORKTREE_RECORD_FILE moved here), so a hand-made git worktree add of the root is a workspace of its own, and a set copy's absolute worktrees_dir is read as that checkout's.
• recorded_project and recorded_set read meta's worktree record; gitfile_target names the git dir a .git file points to; meta_config_at reads one directory's config (--config name or the default).
• resolve_inside follows a link whose target doesn't exist yet the way the OS would (each existing part resolved as the OS does, so links are followed before a later .. and Windows paths meet the base in its \\?\ form; .. out of a missing directory refused; at most 40 links; the rest of the path still checked), so a link the root checkout copies into a set leads to where its repo goes and a link out is still refused. Its errors escape the path.
• Duplicate project keys are an error naming the key and file (JSON and YAML), checked on MetaConfig itself.
• data_dir tests no longer set the process-global META_DATA_DIR (the macOS CI flake).

Part of the meta stability set: gitkb/meta#128 has the full description and how it was verified. Merge together with it (same branch name, so CI builds them together).

Implements [[tasks/harmony-2793]]

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